Place the folded paper on a solid surface and use a spoon to carefully crush the tablet into a powder. To do this, put the tablet to be ground inside a clean, folded piece of paper.
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Take care not to break them, as the tablets are very brittle. Take four antacid tablets out of their packages.Four clear 12-ounce (or larger) drinking glasses.Effervescent antacid tablets (at least four).In this activity, you will demonstrate this effect by measuring the rate of a different kind of chemical reaction: the dissolution of sodium bicarbonate from an effervescent antacid tablet in water. Increasing the surface area of a reactant does not only increase the quantity of material available to react, but will also increase the rate of the reaction.
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However, the same flammable material dispersed into the air as a fine powder would allow for much greater surface area exposed to the air, allowing for a rapid explosion if ignited. Take a flammable material (such as flour) as an example: If you heat up a lump of flour, it will not burn at all or will start burning away slowly in a controlled manner because there is only a limited surface area available that can react with the oxygen in the air. However, if you take the same material and break it into smaller pieces, there is much more surface area exposed that can interact with the other components-allowing the chemical reaction to occur much more quickly. This can only happen at the surface of the solid, as all the molecules trapped within the body of the solid cannot react until they meet the molecules of the other reactant. How does this work? For a chemical reaction to happen, the molecules or atoms of the reactants need to collide with each other.
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In chemical reactions that include a solid as one of the reactants, you can actually change the reaction rate by varying the size of the solid that reacts with the liquid or the gas. Some chemical reactions happen very fast (think vinegar and baking soda), whereas others take a very long time (such as rust forming on metal). In this activity, you can try this for yourself-skipping the explosion and creating a big fizz instead! Why is that? It has to do with the particle size of the solid material, which determines how rapidly a chemical reaction takes place. In fact, any solid flammable material that is dispersed in the air as a dust cloud will explode if it comes into contact with flame (a reason extreme caution must be used where there is a large amount of grain dust, such as in storage facilities). You need a very fine powder of flour to make an explosion happen. Did you know that flour can explode? Luckily, this does not happen spontaneously on your kitchen counter, but only if the conditions are right.